A bit inconsistent here - asking for help because of "hair trigger" pitch stability, while saying you got around in the jibe and managed to swap your feet a bunch of times. Most people need dozens of sessions to get to this point, some need hundreds.
You're on a wave front wing for advanced wingers that is loved because it reacts very well to input. That is very different from beginner foils, which are much more forgiving, and react very slowly. But you've paired the fast-reacting foil with very long fuse that slows down how fast the gear reacts to input. So you experience a lot more feedback from the foil, but the timing is off, as stroppo has explained quite nicely. You try to compensate by using a very wide stance, which creates more problems.
Get the shorter (70 cm) fuse. It may make the foil feel even less pitch stable, but you'll have a better chance of timing your adjustments correctly. Sounds like your front wing position is ok; with a shorter fuse, you'll have to move the mast more forward, by the same amount the front wing is further away on the longer mast.
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dieseagull said..
I've posted a pic of my foot placement on the board just above this post, and the foil wing is pretty much underneath the orange diamond on the deck.
The foot placement that you indicated shows your stance is even wider than if you had both feet in the straps. That makes your life a lot harder since it gives you more leverage over the foil than a narrower stance. You're much more likely to over-correct with a wider stance, causing touchdowns and overfoiling. It's a natural thing to go for a wider stance for more stability, lots of beginners do this. The #1 tip from a very experienced wing instructor when beginners complain about the board being to twitchy when they start getting up on the foil is to put the feet closer together. Many jibe tutorial also suggest to move the feet closer together before the jibe to reduce the effect of weight shifts, and the resulting ups and downs.